Rs-232 Pass Thru Port; Setting Up Contact Closure Control; Controlling An Extron Av Switcher - Extron electronics SW2 USB User Manual

RS-232 Pass Thru Port

The RS-232 Pass Thru port loops the signal received at the SW USB RS-232 control port, the
Contact (closure) port, or the front panel input buttons through the RS-232 Pass Thru port
to send SIS commands to another Extron AV switcher.
NOTE:
You can configure the SW USB to send SIS commands or input selections through the
RS-232 Pass Thru port to the AV switcher. Two loop modes are available:
•
•
See
the "Operation" section for more information on the loop modes and SIS commands.
The diagram below shows how to wire the SW USB RS-232 Pass Thru port for use with an
Extron AV switcher. The RS-232 Pass Thru port does not have a receive pin; therefore, it
does not receive responses from the connected switcher.
Host Port
Figure 6.

Setting Up Contact Closure Control

Contact closure is another method of input selection. To enable input selection by contact
closure, connect a push-button contact closure device (such as an Extron CCR 2BLB,
CCR 4BLB, or CCR 204) to the SW USB Contact port.
Alternatively, you can manually short one of the pins to ground (the ground [_] pin is pin 3
for SW2 and pin 5 for SW4 models) using a jumper. Shorting pin 1 to ground selects input
1, pin 2 selects input 2, and so forth.

Controlling an Extron AV Switcher

For applications in which the SW USB is connected to an Extron AV switcher that can be
controlled via RS-232, inputs can be selected on both switchers by contact closure.
To set up for contact closure control of an AV switcher:
1.
2.
3.
Only Extron products can be controlled via this port.
Loop mode 0: The port passes through SIS commands from the computer, input
selections made via contact closure, and input selections made by pressing front panel
buttons.
Loop mode 1: The port passes only SIS commands from your computer.
"Issuing Commands to an Extron AV Switcher via the RS-232 Pass Thru
2
3
5
RS-232
Port
PC
Connections for RS-232 Loop-through
If desired, connect a contact closure device to the SW USB Contact port.
Connect the SW USB RS-232 Pass Thru port to the RS-232 port on the AV switcher (see
figure 7
on the next page).
Issue the SIS command E
"Selecting the loop mode" in the "Operation" section for more information).
Tx
Tx
Rx
Tx
Rx
Pass Thru
Port
SW USB
Extron
AV Switcher
} to the SW USB to enable loop 0 mode (see
0LOOP
Port" in
SW USB Series • Installation 9